我用F28335的ADC时,按照数据手册说明,外接20K电阻和两个2.2uf电容,电源之间采用4N7磁珠隔离,给定固定输入,测得的采样值最后3位都在波动,这应该不正常吧?请问可能原因是什么?F28335的ADC的精度实际可以达到几位?
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请参考下面帖子
http://www.deyisupport.com/question_answer/microcontrollers/c2000/f/56/t/72147.aspx
首先确认你输入的信号的稳定性 连接都参考了手册说明
PCB设计更重要 10位应该能达到吧